The most popular online dictionary and thesaurus for learners of English
radium noun
/ˈreɪ.di.əm/ n [U] Definition
a radioactive element which is used in the treatment of some diseases, especially cancer
(Definition of radium noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Browse the Dictionary
Our dictionaries
Browse the Thesaurus
Word of the Day
Blog
New Words
Find words and meanings that have just started to be used in English, and let us know what you think of them.
